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diff --git a/Source/WebCore/platform/FileStream.h b/Source/WebCore/platform/FileStream.h
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+/*
+ * Copyright (C) 2010 Google Inc.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef FileStream_h
+#define FileStream_h
+
+#if ENABLE(BLOB) || ENABLE(FILE_SYSTEM)
+
+#include "FileSystem.h"
+#include <wtf/Forward.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+
+namespace WebCore {
+
+class KURL;
+
+// All methods are synchronous.
+class FileStream : public RefCounted<FileStream> {
+public:
+    static PassRefPtr<FileStream> create()
+    {
+        return adoptRef(new FileStream());
+    }
+    ~FileStream();
+
+    // FIXME: To be removed when we switch to using BlobData.
+    void start();
+
+    // Aborts the operation.
+    void stop();
+
+    // Gets the size of a file. Also validates if the file has been changed or not if the expected modification time is provided, i.e. non-zero.
+    // Returns total number of bytes if successful. -1 otherwise.
+    long long getSize(const String& path, double expectedModificationTime);
+
+    // Opens a file for reading. The reading starts at the specified offset and lasts till the specified length.
+    // Returns true on success. False otherwise.
+    bool openForRead(const String& path, long long offset, long long length);
+
+    // Opens a file for writing.
+    // Returns true on success. False otherwise.
+    bool openForWrite(const String& path);
+
+    // Closes the file.
+    void close();
+
+    // Reads a file into the provided data buffer.
+    // Returns number of bytes being read on success. -1 otherwise.
+    // If 0 is returned, it means that the reading is completed.
+    int read(char* buffer, int length);
+
+    // Writes a blob to the file.
+    // Returns number of bytes being written on success. -1 otherwise.
+    int write(const KURL& blobURL, long long position, int length);
+
+    // Truncates the file to the specified position.
+    // Returns true on success. False otherwise.
+    bool truncate(long long position);
+
+private:
+    FileStream();
+
+    PlatformFileHandle m_handle;
+    long long m_bytesProcessed;
+    long long m_totalBytesToRead;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(BLOB) || ENABLE(FILE_SYSTEM)
+
+#endif // FileStream_h